I have only now went through my box and checked all resistors (why didn't I do this in the beginning :oops: ) and have found a few that are potentially wrong/faulty but would appreciate some help....

All resistance values have been tested in-situ, and initially I thought there were some issues around R74-90 but remembered that quite a few are in parallel, so give 100k readings rather than 200K. So...

....are there any other places where resistors are effectively in parallel and so will give a measurement that is different from the BOM? :?: :?:

Other than that there are a few discrepancies:

R64, R65, R109, R112, R116 - should be 10k but measuring 6.8 or 7.4K. Are these withing acceptable limits or worth swapping?R60 (22k) - actual reading 17.6K. Again, not miles away but more than 5%

you really have to look (and understand) the circuit to be able to tell if you can really measure a given resistor as it is - in circuitthe multimeter runs a small amount of current and it *can* and *will* flow thru all possible ways, not just thru the resistor you're measuring, which would make your measurement incorrect

i don't know enough about electronics to tell easily which of the resistors you can and which you can't measure in-circuit.. i'd personally desolder and test

Then id perhaps say , try different caps in the vco and vcf. Transparent yellow nichicons (yx series i think they are called) or polystyrene(a bit hard to find in larger values). And set r97 for more ut less self resonation.

OK, here are a couple of examples of saw and square. Resonance is always max (except for a bit at the end where I lower it) and starting from zero cutoff and env/decay/accent are initially at min, then mid, then max:

Strangely enough the recorded files (straight from headphone out to audacity in my laptop) actually sound a bit better in playback that I reckon the box actually sounds whether listening in phones or through my mixer. Go figure.